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it protects the cliff from being eroded quickly and also deflects some of the energy of the waves
http://wiki.answers.com/Q/What_are_Advantages_of_R...
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the disadvantages of this is that it can be undermined (moved by the waves) and it is also quite ugly and it is not sustainable on long term and need of constant maintenance and also
http://wiki.answers.com/Q/What_are_the_disadvantag...
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advantages absorbs energy from storm waves, prevents erosion. disadvantages can be moved by the sea (undermined)
http://wiki.answers.com/Q/What_are_the_advantages_...
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Rock armour cost the same as sea walls because rock armour is a form of sea wall to it cost £6000 per m. Just go to http://www.mjanderson.chislehurst.btinternet.co.uk/coastseadefence.htm
http://wiki.answers.com/Q/How_much_does_rock_armou...
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